The results of the theoretical analysis and experimental study of dispersion characteristics for thick reflection holographic gratings are presented. The examination of the diffracted beam intensity is made for the conditions when both the wavelength and angle of the reconstructing wave may differ considerably from those at the recording step. In this case the magnitude of the diffracted signal can be described through the joint function of the angular-spectrum selectivity (ASS). This is of special interest when color holographic image is reconstructed with the wide-band light source. For true color image reconstruction the character of the ASS-function should be taken into consideration, as the angular-spectral dispersion depedns upon the reconstructing wavelength and recording geometry.
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